Hi All, Here is my question regarding the solution of this little movie => http://www.somasimple.com/flash_anims/ap_003.swf A thin elastic tube (thickness = 1) is connected with a thicker one (40 times thicker than the previous section). The tubes are poured with water. A wave is is travelling in the first section changing the shape of the tube (I emphasized the deformation on the movie). Its speed (constant) is known and equals to c1. What happens when the wave reaches the thicker tube? It is supposed that thre is no wave reflection. Is c2 > c1? How is the amplitude changed?